Door-bell and burglar-alarm



(No Model.)

J. T. STONE.

DOOR BELL AND BURGLAL ALARM.

N0. 530,667.v Patented'Dec. 11, 1894.

Tn: mams PETERS co. rnorourno., WASHINGTON. '0. c.

i UNITEDv STATES- IPATENT OFFICE.

JOI-IN T. STONE, OF OAKLAND, CALIFORNIA.

ooOR-BELL AND BuRGLAR-ALARM. 'i f SPECIFICATION forming part of Letters Patent Nor/530,667, dated December 11, 1894.

. c Appiaation nea August 28,1394. semi It 521.539. cromatik To all whom it may concern: s

Beit known that I, JOHN T. STONE, a citi-v zen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented certain new and useful Improvements in Call and Alarm Bell Signals; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable Others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part ofy this specification. l

Figure 1, represents a plan View showing the bell and upper plate A removed.A Fig, 2, is a side view of the apparatus and edgeview of the door. Eig. 3, is a cross sectional view of the same on the line frof Fig. l.k Fig. 4, is a detail to be referred to.

My present inventionY relates to call and alarm bell signals as disclosed in my former application, Serial No. 512,683, filed May 28,

1894, upon which this invention is an improvement; and myinvention consists of the constructions and combinations of devices which I shall hereinafter fully describe and claim.

The object of the present invention is to provide a simple, cheap and easily Operated mechanism which may be attached to doors,- windows and analogous devices, in such a manner that the opening of said door or-wiudow will instantly set the alarm mechanism in motion and by strokes upon a bell give an alarm to indicate that vthe door or window is being moved. v

Another object is to combine with such a mechanism above mentioned, of .a supplemental alarm mechanism adapted to operate upon the same bell whereby the construction may be used when connected with a door or window, as a simple door or call bell, independent of the automatic arrangement which is dependent upon lthe movement of the door or window to set its mechanism in motion to indicate such movement.

In the accompanying drawings, A represents the main plate to which the well known form of bell B is attached, as by a central post a and locking screw b nut or equivalent device, whereby the said bell 'is readily securedto and detached from the plate. VThis plateA is secured a proper distance from the base plate A by means of posts c so asjto provide space for the arrangement o f the gearing and otherfeatures of the alarm mechanism; the said base plate A beingqsecured tothe door or windowin any well known and appropriate manner.

On the inner face of the plate A is journaled a gear wheel C, which carries apinion D; the said wheel C meshing with `a pinion E von a shaft F which also carries an arm d to which a hammer e is pivotally hung, whereby asthe wheel C is rotated the hammer is caused to strike the innersurface of the bell and sound the alarm. y i u l The pinion D which is fixed to and turns with the wheel C meshes with a gear wheel G tix'ed upon a shaft H suitably mounted and extending through the base plate; and this gear wheel has a pawl f pivotallysecured upon it and engaged by a spring g which normally holds it in 'engagement with the teeth of ratchet wheel l which is loosely mounted upon the shaft H and is provided with a pinion J which turns with it, whereby when the ratchet Wheeland its pinion are turned in one direc-4 tion the pawl f will slip freely over the teeth of the former without imparting movement to the gearwheel G and its engaged pinion D which carries the gear wheel C. When turned inan opposite direction the pawl f will engage the teeth of the ratchetlwheel I and thus lockV this'wheel to thegear wh'eelG whereby the movement of the ratchet and its attached pinion will be communicated to and through the pinion D, gear wheel C and pinionE to the hammer, to cause the latter to strike against the inner surface of the bell and give a continuous alarm as long as the devices named are in motion.

Upon one of the posts c orotherwise located if desired, is pivotally mounted a lever L having an arm h extending to one side ofthe post and having its opposite end formed into a curved or segmentalrack l which is adapted to engage the teeth of the loosely mounted pinion J.

A'band or/helical spring Sis interposed between the'lever L and base plate A and has one of itsY terminals secured to the hub One of the essential features of the present improvement is the connection between the lever L and the door( jamb or window casing, which permits me to control the length of the alarm to be sounded whereby a single stroke may be sounded or the bell caused to ring for i a short period, or this period may be extended to cause a continuous unbroken alarm d uring the whole time the segment portion of the lever L is in motion. This adjustable connection comprises a two part rod M one of whose members rnl is secured to the arm h of the lever, and whose other member n is loosely connected with one arm rof a trip or lever N pivotally hung on a shaft or rod p mounted in ears or bearings formed on a plate or bracket O secured to the door near its edge with one of its ends formed with` claws which are turned over the said edge and embedded as'shown, or the plate may be otherwise secured if desired.

The two parts of the rod M are threaded at their adjoining ends and connected by a turn buckle P or equivalent means whereby the rod may be lengthened or shortened to regulate the position or angle of the trip or lever N and the consequent throw of the segmental lever and winding ofthespring; it being uu derstood that the movement of said parts controls the length of the alarm sounded, which :may be in the nature of a single or a couple of strokes, or it may be prolonged for a more extended period of time.

The arm 'r' of the trip lever N is designed to normally stand at an langle between the vertical edge of the door and its jamb or casing when the door is open, but when the door is closed this end or arm fr of the lever is pressed against the jamb, which causes the lever N to rock upon its shaft or support so that its opposite end will draw upon the two part adjustable rod or connection M, thus moving the lever L about its pivotal center so that its segmental rack portion may move forward, turning the loose pinion and ratchet, and winding the spring S so as to set the alarm. Now, when the door is moved, the trip lever is released and the spring immediately commences to unwind, returning the lever L and causing the loose pinion H and ratchet I, which in this movement are united to turn with the gear wheel G by the pawl f, and the scribed, and the spring is wound up and remains so until the door is again opened.

In order that the trip lever N may be held in its depressed condition with the spring wound and under tension, which position will allow the door to be opened and closed without disturbing the alarm mechanism, I pivotally mount upon the bracket or plate O a plate or latch R which may be in the form of a segment or eccentric, which is designed to be moved against the arm r of the trip lever to maintain said lever in a depressed condition.

In some `instances I may wish to employ this same apparatus as a call bell to be operated by hand from the outsideot the door, so as to combine the alarm and call features in a single apparatus. This is done by fixing a disk or plate T to the shaft 4H which carries the loose pinion and gear G and providing the same with a spring actuated pawl u (see Fig. 4) which engages a ratchet wheel U on a sleeve which passes into thedoor and'carries a turning handle at its outer end. When this handle is turned the pawl u will, by its engagement with the ratchet U, turn the disk or plate T and its shaft and transmit the motion of the handle to the hammer and bell, through the train of gearingbefore described, without aecting the spring S or calling upon the latter to exert its power to sound the alarm; the pawl fslipping upon the ratchet I which is loose upon its shaft., so that the motion of the gear wheelG does notaflectthe rack lever or the spring; these two features being called into operation only when the automatic sounding of the alarm is desired.

When the automatic mechanism isused the pawl f locks the wheel G to the ratchet I so that both turn together in one direction to start the other gears in motion to ring the alarm, but the motion of said parts is prevented from being imparted to and moving the turning handle of the call bell mechanism bythe pawl u slipping upon its engaged ratchet U which is carried by said handle, thereby making the automatic and call bell mechanisms entirely independent and capable of independent use.

The apparatus described may be placedat any desired place on the `door or jamband may be applied to a window sash in substantially the manner described `for the door without departing from the spiritof my inven-v tion.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with an alarmbell havinga gong and hammer, and a train of gearing for operating said hammer, of a pivoted rack lever included in said train of gearing, a helical spring surrounding the axis of the rack lever having one end connected with the lever and the opposite end connected with a xed portion of the bell casing, a pivoted trip lever having an arm adapted to be introduced IIO . jamb or casing, and a two-part rod connecting the opposite end of the trip lever withv Amechanism for operating the same comprisbetween a fixed and movable surface, and a ."rod or bar connecting the opposite end of the trip lever with the rack lever, said rod or bar being adjustable in the direction of its length to limit the movement of the trip lever and the consequent winding of the spring and throw of the rack lever. f v ,f

2. The combination, with an alarm having a gong and hammer, a lever having one end formed with'a curved rack surface, a train ofA gearing comprising a gear engaginga pinion on the hammer shaft, and provided with a pinion D, a gear G to mesh with the pinion D, and a ratchet and pinion on the shaft of the gear G, said train of gearing being interposed between said level-and the hammer and adapted to be set in motion by said lever, a helical spring surrounding the axis of the lever and connected with the lever so that it may be wound by the movement of the same, a. pivoted ,trip lever having an arm adapted to be introduced between the door and its the rack lever for adjusting the position of the trip lever and -determining the length of the alarm to be sounded.

, 3. The combination, of an alarm bell having a gong and a hammer, a shaft H having a gear wheel fixed to it, a pinion and ratchet loose on said shaft, a pawl uniting the gear -wheel with the ratchet when the lgear turns in one direction and slipping upon the ratchet when the gear moves in a reverse direction, gearing between said gear wheel and the hammer, a lever having a curved rack portion to engage the loose pinion,a helical spring surrounding the axis of andconnected with the levera two-part adjustable rod extending from the lever, and a pivoted or hinged trip lever connected with the outer end of the rod` gearing between the gear G and the hammer,

a lever having'a segmental rack at one end -is regulated and the length of the alarm to be sounded is determined, a disk lixed on thel shaft which carries the loose pinion and adaptedto slip. upon its pawl when the gear G and its ratchet are united to move together, and to be united withthe vdisk when the said gear and ratchet are caused to slip one on the other, and a handle connected with the ratchet U for operating it, whereby a call alarm may be sounded by the'turning ofthe handle without affecting the automatic mechanism, and the latter mechanism may operate without disturbing the handle of the call alarm. g

5. The combination, with an alarm bell and ing a train of gearing, a fulcrumed rack lever connected therewith, a trip lever between the door and its jamb or casing, and a connection between the trip lever and the rack lever, of a means contiguous tothe trip lever for engaging and holdingA the same depressed and inoperative whereby the door may be open ed and closed without aecting or sound-v ing the alarm.

6. The combination with an alarm bell and mechanism for sounding an alarm, of a trip lever to be inserted between a movable and `Iixed structure, and atwo-part rod and turnbuckle forming an adjustable connection between said lever and the alarm mechanism whereby the length of duration of the alarm is regulated.

In testimony whereof I affix my signature in presence of two witnesses.

n JOHN T. STONE.

Witnesses:

T. W. FowLER, CHAPMAN FOWLER.

6o ratchet, a ratchet U loose on said shaft and 

